#include<bits/stdc++.h>
using namespace std;

const int N = 110;

int n;
bool st[N];
vector<int> res;

int main()
{
    cin >> n;
    
    int cnt = 0;
    for(int i = 1; i <= n + 1; i ++)
    {
        if(res.size() == n) break;
        if(!st[i]) cnt ++;
            
        if(cnt == 3)
        {
            //cout << i << endl;
            st[i] = true;
            res.push_back(i);
            cnt = 0;
        }
        if(i == n + 1) i = 1; 
    }
    
    cout << res.back();
    
    return 0;
}